Ask HN: Beside C language Arrays and Pointers, what else?

you may study how data structures can be represented in C

for example from this book:

Ashok N. Kamthane Introduction to Data Structures in C" http://my.safaribooksonline.com/book/programming/c/978813171...

Not in the same sentence. If you want to learn advanced concepts, try lisp or haskell rather.

You've discovered most of C then. Look over how macros work, then just Google stuff. C is a very basic language that almost anything can created from. pick a project and start building or join an open source project in C

http://eternallyconfuzzled.com/jsw_home.aspx

Everything on this site.